    {:pred :pizza}    {:artifact true
                       :edible true}
 
-   {:pred :shoe}     {:artifact true
-                      :clothing true}
+   {:pred :salad}    {:artifact true
+                      :edible true}
+
+   {:pred :shoe}     {:clothing true}
 
    {:pred :student}  {:human true}
 

   ;; restrictions on owners (e.g. {:of {:human true}}).

   ;; <preds>
   {:pred :backpack} {:artifact true
                      :clothing true}
   {:pred :bag}      {:artifact true
                      :consumable false
                      :event false

                      :place true}

   {:clothing true}  {:animate false
                      :artifact true
                      :consumable false
                      :place false
                      :physical-object true}
   {:consumable
